Composite foundation structure and construction method of micro-friction short pipe piles

Abstract

The invention discloses a minitype friction short tubular pile composite foundation structure and a constructing method thereof. Cement concrete is poured into tubular geotextile, the diameter of which is 10cm, to form a tube embryo, the length of which is 4-5m, the tube embryo is maintained and hardened to form a geotextile-cement concrete tubular pile body (1), the thickness of the geotextile-cement concrete tubular pile body (1) is larger than 1cm, the cross-section compressive strength of the geotextile-cement concrete tubular pile body (1) is higher than 20Mpa, and the geotextile-cement concrete tubular pile body (1) is pressed into a soft foundation, concrete mortar is poured into the pipe hole of the geotextile-cement concrete tubular pile body (1) which is pressed in position, then the concrete mortar is extruded out of the lower pipe orifice of the geotextile-cement concrete tubular pile body (1), and a perfusion tubular pile expanded-foot (2) is formed, the upper pipe orifice of the geotextile-cement concrete tubular pile body (1) is provided with a tubular pile top (3), the tubular pile top (3) is provided with a tubular pile cap (4), and geogrids (5) and filling sand cushions (6) are laid on the tubular pile cap (4) in a layered and alternative manner. The minitype friction short tubular pile composite foundation structure is low in cost, simple to construct, fast in construction speed and good in environmental protection property.

Description

technical field [0001] The invention relates to a composite foundation structure of a soft soil subgrade, in particular to a composite foundation structure of miniature friction short pipe piles. The invention also relates to the construction method of the composite foundation structure of the miniature friction short pipe pile Background technique [0002] Coastal soft soil is often dominated by loose saturated silty clay and silt, and contains silty clay in the shallow layer. In the construction of expressway subgrade, when the thickness of coastal soft soil is not large, it is generally treated by replacement, riprap, and cushion method; for thick-layer bangtang soft soil, cement mixing piles and CFG piles are often used for treatment. For low-grade roads with low construction costs, such as county and township roads and tourist roads, if cement mixing piles and CFG piles are used for road soft soil foundation treatment, although the technology is mature, it is often dif...

AI Technical Summary

Problems solved by technology

However, wooden piles must be made of water-resistant wood, which does not conform to the technical principles of ecological civilization. Therefore, it is necessary to develop a new type of wooden pile-like composite foundation structure that can replace wooden piles, and is used for low-grade roads, low embankments, thick-layer soft Soil roadbed treatment

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